Day 4

99問 • 1年前

Emerson Ong

通報

問題一覧

There is no CBR test for item 300 - aggregate surface course.

true

Item 311 and 405, grading is perform _______ .

for every 75 cu.m

For pip culverts and storm drains, the minimum test is 1 - pipe for every 50 pipes. What is the alterative requirement?

1 - set consisting of 3 concrete cylinder samples for ot more than 25 pupes cast in the field and 1 - inspection report for each size for not more than 25 pipes cast in the field.

The minimum test requirement for paint is _____ .

1 - sample for every 100 cans or fraction thereof

The minimum test requirement for water used in concrete for a questionable source is _____ .

1 - Quality test

Based on the maximum dry density obtained by laboratory test, the degree of compaction required for aggregate sub base should be at least. ______ .

100%

Per our present specification for highways and bridges including amendments, it is mandatory to open PCCP to traffic not later than ______ .

14 days after pouring

In casting reinforced concrete railings, the concrete usedis _______ .

Class C1

For efficient compaction, the embankment materials should at the time of rolling be _______ .

at optimum moisture content

For a road base course the most preferable material is one with CBR of _________ .

Peat and muck are ______ .

unsuitable soil

The slump test on concrete is a measure ______ .

consistency

The fineness modulus is highest of ______ .

very coarse sand

If concrete is continuously moist cured, it will again strength beyond 180 days.

false

The quality of paying concrete is usually measured by its ______ .

flexural

Generally speaking, batching of concrete aggregate by volume is preferable than weight.

false

If angular coarse aggregate is used in a concrete mix, it will require more _______ .

water and fine aggregates

The most favorable period for cuing concrete is _______ .

after 3 days

Lower water content ratio in concrete mixes improves _______ .

strength

When concrete must be placed in a slopping surface, placing should start at the ______ .

Bottom

The maximum percent abrasion loss allowed for concrete coarse aggregate is _______ .

40%

The plasticity index of aggregate base course should be not greater than ______ .

In casting of reinforced concrete pile, the concrete used is ______ .

The natural water content of highly organic soil is ______ .

more then 100%

Which of the following dead load is equivalent for loose sand, earth and gravel fill?

1,603 tons/cu.m

Rate of application for curing compound is ______ .

0.30 li/sq.m

During coring of complete pavement, how many cores/km/lane is required as per specification?

What is the correct proportion for concrete masonry work?

1:2

The opening of No. 4 sieve is bigger than the opening of a 1/4 sieve.

true

The standard compaction test on predominantly fine grained soils is performed on soil fraction passing sieve no.

Which plasticity index would you prefer for the base course of PCCP?

less than 6

A soil which is classified A-7 by the highway research board method will have a subgrade rating of ______ .

poor

The empirical number used in design is ______ .

group index

Soil is fully saturated at optimum moisture content.

false

Water content of soil is generally base on ______ .

total weight of soil

Optimum water content of soil is determined by _______ .

compaction test

The particle size distribution of soil is determined by _______

sieve analysis test

Which of the following are most suitable for construction of highway embankments?

Gradular

The particle size distribution of sandy gravel is determined by _______ .

sieve test

The best soil for a road subgrade would behave a group index of ______ .

less than 3

The highest moisture content in the plastic state of fine grained soils is the ______ .

plastic limit

Which of the following is characterizes unsuitable materials?

all of the above

Shingage factor test is ______ .

test to determine volume change

Soil is fully saturated if the water content is _______ .

none of the preceding

He density to which a soil can be compacted is related to _____ .

water content

Specification require 1 quality test every ______ of asphalt mix.

40 ton

All asphalt are ______, they became harder as temperature decreases and softer as their temperature increases.

thermoplastic

the viscosity of the asphalt during mixing and lay down is _______ .

viscosity at 60*C

The trial section for compaction for each type of fill materials and type of equipment to be used in the work should have an are of ______ .

500 sq.m

Control slip shall have an area of approximately ______ .

335 sq.m

Fine aggregate used in asphalt mix is the one ______ .

passing the no.8 sieve

The corrugation produce y brooming is ________ .

1.5 mm

The higher the _______ , the lower the penetration.

viscosity

The required thickness of thermoplastic paint in PCCP is _______ .

3.2 to 4.8 mm

What percent of hydrated lime shall be added to the mixture during mixing operation of asphalt mix?

0.5 to 1.0 mass %

As material engineer, what would you recommend in order to check the suitability and efficiency of the equipment to use prior to sub base construction for item 310, bituminous concrete surface course?

make a trial section

Quality of factor - produced reinforced concrete pipes may be best established through what?

compressive strength test

Result of Immersion _ Compression test conducted on a bituminous mix sample are as follow: Dry stability + 2,000 kpa, Wet stability = 1,000 kpa, What is the resulting Index of Retained Strength

50%

In DPWH Contract Projects, Quality Control is the soil responsibility of _______ .

the DPWH project personnel

As materials engineer, when is the right time to start sampling and testing of materials to be incorporated in the work?

before start of work items

The spot test on asphalt is used to determine what?

overheating during manufacture

Under what climate conditions do we use higher penetration grade asphalt cement?

cold climate

What is the basis for rejection or acceptance of any construction materials?

materials test report

Initial rolling of bituminous mixes shall be performed with a ______ roller.

pneumatic

What grade of asphalt has a penetration grade of 0 - 30?

blown asphalt

Problems regarding quality of construction materials shall be reported directly by the Contractor's Materials Engineer to the _______ .

DPWH materials engineer

If the RC pipes the forgoing problem is not cast in the field, how many pipes ll be required to be subjected to the crushing strength test?

75 pcs

How many concrete cylinder samples are required for 3,500 pcs. Of reinforced concrete pipes?

75 sets of 3

What is the bitumen obtained from the distillation coal or wood?

tar

How do you educe the viscosity of Medium - Curing Cutback Asphalt? By mixing it with _____ .

kerosene

What establish the exact percent of aggregates and asphalt content in the bituminous mix ______ .

job mix formula

What greatly influence he serviceability of an asphalt pavement?

density and compaction of complete pavement

In asphalt pavement construction, how is the surface level of the completed pavement check?

by the use of 3 meter straight edge

What primarily influence the grade of asphalt to be selected?

penetration

Who will approve the job mix formula?

DPWH project/material engineer

What control during the mixing and compaction of the bituminous pavement is of great significance in the resulting pavement?

temperature

In asphalt pavement construction, here are three phases of rolling; what kind of roller is required to be used for the final compaction and smoothing?

tandem - smooth wheeled roller

What is the maximum speed of the roller in compaction of asphalt pavement?

5 kph

What shall be checked after final rolling?

degree of compaction

When is completed asphalt pavement opened to traffic?

When the asphalt has cooled to atmospheric temperature

The apparatus used in determining the consistency of asphalt cement is _______ .

penetrometer

How is the consistency of liquid asphalt determined?

viscometer

The optimum asphalt content obtained in marshall stability test is the average asphalt content of the maximum stability, maximum bulk specific gravity, and _________ .

4% air voids

What test determines the safe working temperature of the asphalt?

flash point test

_________ are usually ested for extraction

asphalt mixes

Steel bars for concrete reinforcement are tested for their ______ properties.

Tensile and bending

What method is used in determining the strength of concrete pipes?

three edge bearing method

How many units shall be tested for strength, moisture and absorption in a lot of 120,000 CHB

18 units

For 250 gallons of reflectorized traffic paint, how many sample are required to be submitted for quality testing?

3 samples

The bituminous mix should have a mass % of air voids within the range of ______ .

3 to 5%

Traffic paint shall be applied to the pavement at the rate of 0.33 li/sq.m. and shall dry sufficiently to be free it from cracking from ______ .

15 to 30 mins

This is the only class riprap that may consist of round natural stones.

Class A riprap

The surface of riprap shall not vary from the theoretical surface by more than ______ mm at any point .

100 mm

Fine aggregates of masonry shall all passes the _______ mm sieve.

No. 8 sieve

Mortar that is not used within _______ minutes after the water has been added shall be discarded

90 mins

Maximum projection of rock faces beyond the pitch lines shall not be more than _______ .

50 mm

In hot or dry weather, the masonry shall be satisfactory protected from the sun and shall be kept wet for a period at least ______ after completion.

3 days

For pavement markings, the composition of white paint shall be _______ pigment and ______ % of vehicle

42 - 45% pigment ; 53 - 55% vehicle

The composition of yellow paint shall be ______ pigment and ______ vehicle.

23% pigment and 77% vehicle

MT 4

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MT 4